export type PostJsonInput = {
  url: string;
  headers?: Record<string, string>;
  body: unknown;
};

export type PostJson = (input: PostJsonInput) => void;

type WxLike = {
  request?: (opts: {
    url: string;
    method?: string;
    header?: Record<string, string>;
    data?: unknown;
    fail?: () => void;
  }) => void;
};

function getWx(): WxLike | undefined {
  return (globalThis as { wx?: WxLike }).wx;
}

/** fire-and-forget POST JSON；优先 fetch，小程序回退 wx.request */
export function postJson(input: PostJsonInput): void {
  const headers = input.headers ?? { 'Content-Type': 'application/json' };

  if (typeof fetch === 'function') {
    void fetch(input.url, {
      method: 'POST',
      headers,
      body: JSON.stringify(input.body),
    }).catch(() => {});
    return;
  }

  const wxApi = getWx();
  if (wxApi?.request) {
    wxApi.request({
      url: input.url,
      method: 'POST',
      header: headers,
      data: input.body,
      fail: () => {},
    });
  }
}